100% local · no uploads · free

Sign a PDF for Free

You received a lease agreement, an NDA, or a permission slip and need to sign it before sending back. You do not have a printer, you do not have a scanner, and you are not paying Adobe $20/month for the privilege of putting your name on a page.

KuroPDF lets you sign PDFs directly in your browser — for free, with no account, and without ever uploading the document. Draw your signature with a mouse or finger, type it in a handwriting font, or upload a photo of your real signature. Then drag it to the exact position on the page and download the signed PDF.

This is not a "fill and sign" service that stores your documents in someone else cloud. Everything processes locally. Your contract, your signature, and the final output all stay on your device. Period.

Electronic signatures created this way are legally recognized in most jurisdictions under the US ESIGN Act (2000), EU eIDAS Regulation (2014), and equivalent laws in Canada, Australia, India, and most other countries. For simple agreements like leases, NDAs, consent forms, and internal documents, a drawn or typed signature is legally binding.

Sign PDF free →
  • Files never leave your device
  • No size limits
  • Free, no sign-up

Frequently asked questions

Is this legally binding?

Yes. Electronic signatures are legally recognized in most jurisdictions under laws like ESIGN (US), eIDAS (EU), and equivalent legislation worldwide. For simple agreements (leases, NDAs, consent forms), a drawn or typed signature holds the same legal weight as a wet ink signature.

Can I use my real handwritten signature?

Yes — photograph your signature on white paper, upload the image, and the tool removes the background automatically. Position it anywhere on the document.

Do I need to create an account?

No. No account, no email, no sign-up. Open the tool, sign your document, and close the tab.

Is my signed document uploaded anywhere?

Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.

Can I sign multiple pages?

Yes — place your signature on any page of the document. You can also add date stamps, initials, and text annotations alongside your signature.

How is this different from DocuSign or Adobe Sign?

DocuSign and Adobe Sign are workflow tools for sending documents to multiple signers with tracking and audit trails. KuroPDF is for the simpler case: you have a PDF, you need to put your signature on it, and you want it done in 10 seconds without paying or creating an account. For multi-party signing with audit trails, those paid services are more appropriate.

The real difference

Why KuroPDF exists

Every other PDF tool uploads your files to their servers. We think that is broken. Here is what we do differently - and what the alternatives actually cost you.

Nothing leaves your device

Files are processed in your browser using WebAssembly. Open DevTools → Network tab and verify: zero upload requests. Ever.

What competitors do instead:

Smallpdf, iLovePDF, and Adobe Acrobat all upload your files to their servers - your contracts, bank statements, and medical records pass through third-party infrastructure.

No file size limits, no daily caps

Process a 500-page PDF or batch-convert 200 photos. No cap, no throttle, no upgrade wall. Your device is the only limit.

What competitors do instead:

Smallpdf limits free users to 2 tasks per day. iLovePDF caps file sizes at 100MB. Adobe requires a $19.99/mo subscription for basic features.

Works completely offline

Install KuroPDF as a progressive web app. After the first visit, every tool works with zero internet - on a plane, in a bunker, wherever.

What competitors do instead:

Every cloud-based PDF tool stops working the moment your Wi-Fi drops. No connection = no work.

Real encryption, not security theatre

Password protection uses AES-256 encryption via a WebAssembly build of qpdf. The password never leaves your machine - there is no server to intercept it.

What competitors do instead:

When you 'protect' a PDF on Smallpdf or iLovePDF, your unencrypted file and password travel to their server, get processed, then get sent back. That is not security.

Free forever, no account needed

No login wall, no email harvesting, no 'continue with Google' popup. Open the site, use the tool, close the tab. Done.

What competitors do instead:

Adobe charges $239/yr. Smallpdf charges $108/yr. iLovePDF charges $84/yr. All require account creation to use basic tools.

Professional-grade codecs

MozJPEG for JPEG, OxiPNG for PNG, AVIF and WebP encoders - the same codecs used by Google and Mozilla. Not generic re-encoding.

What competitors do instead:

Most cloud tools use basic server-side encoders with less optimization control. You get worse compression at lower quality.

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